Hello to all,
I believe some of you are in dilemma but I hope so meany of you are much more experience than I am. Making decision of changing bearing base on envelope alarms is not always the best approach but if all envelope filter are set up correctly and it is nice development of bearing fault frequency over life ob bearing what your you advice and do you have a reference to point out for correlation amplitude in envelope spectrum with level of fault in bearing. I am referring to regular roiling bearings and usual speed of 1500 RMP. I would like to avoid replacing bearing if there is not viable damage...I usually confirm it with time signal but also usually damage is to large. I am trying to correlate amplitude in envelope spectrum and bearing fault like; under surface fault amplitude, initial small visible surface present amplitude, and significant but not big surface envelope amplitude. What is your experience and do you have some references?
I know about a general rule established for the severity assessment of enveloped spectra. This involves measuring the amplitude of the specific component defect (whether inner race, outer race, ball spin, cage defect frequencies or any combination of each) in dB above the carpet level of spectrum. Any other and what is your experience.